继续收口暗色弹窗底部动作区

新增 PlatformDarkModalFooter 统一 dark modal footer 的布局壳
接入 NPC 弹窗、选择定制弹窗、任务更新弹层与物品详情 footer
补充组件级与弹窗集成测试并更新收口计划和共享决策记录

src/components/NpcModals.tsx

@@ -29,6 +29,7 @@ import {
   UI_CHROME,
 } from '../uiAssets';
 import { PlatformActionButton } from './common/PlatformActionButton';
+import { PlatformDarkModalFooter } from './common/PlatformDarkModalFooter';
 import { PlatformDarkOptionCard } from './common/PlatformDarkOptionCard';
 import { PlatformEmptyState } from './common/PlatformEmptyState';
 import { PlatformPillBadge } from './common/PlatformPillBadge';
@@ -427,7 +428,7 @@ export function NpcModals({ gameState, npcUi }: NpcModalsProps) {
               </div>
             </div>
 
-            <div className="flex items-center justify-end gap-3 border-t border-white/10 px-4 py-3 sm:px-5 sm:py-4">
+            <PlatformDarkModalFooter data-testid="npc-trade-footer">
               <PlatformActionButton
                 surface="editorDark"
                 tone="secondary"
@@ -445,7 +446,7 @@ export function NpcModals({ gameState, npcUi }: NpcModalsProps) {
               >
                 {tradeMode === 'buy' ? '确认购买' : '确认出售'}
               </PlatformActionButton>
-            </div>
+            </PlatformDarkModalFooter>
           </motion.div>
         </motion.div>
       )}
@@ -665,7 +666,11 @@ export function NpcModals({ gameState, npcUi }: NpcModalsProps) {
               )}
             </div>
 
-            <div className="flex justify-end gap-3 px-5 pb-5">
+            <PlatformDarkModalFooter
+              bordered={false}
+              padding="bottom"
+              data-testid="npc-gift-footer"
+            >
               <PlatformActionButton
                 surface="editorDark"
                 tone="secondary"
@@ -683,7 +688,7 @@ export function NpcModals({ gameState, npcUi }: NpcModalsProps) {
               >
                 确认赠礼
               </PlatformActionButton>
-            </div>
+            </PlatformDarkModalFooter>
           </motion.div>
         </motion.div>
       )}
@@ -763,7 +768,11 @@ export function NpcModals({ gameState, npcUi }: NpcModalsProps) {
               )}
             </div>
 
-            <div className="flex justify-end gap-3 px-5 pb-5">
+            <PlatformDarkModalFooter
+              bordered={false}
+              padding="bottom"
+              data-testid="npc-recruit-footer"
+            >
               <PlatformActionButton
                 surface="editorDark"
                 tone="secondary"
@@ -781,7 +790,7 @@ export function NpcModals({ gameState, npcUi }: NpcModalsProps) {
               >
                 确认招募
               </PlatformActionButton>
-            </div>
+            </PlatformDarkModalFooter>
           </motion.div>
         </motion.div>
       )}